Heat-exchange device



Jan. 6, 1931.

c. E. sczo'rTA Filed Dec. 24, 1928 3 Sheets-Sheet 1 l JE 5700?? Jan. 6, 1931. Q E, SCOTT 'y 1,788,068

HEATEXCHANGE DEVICE Filed Dec. 24, 1928 s lsheets-sheet 2 L M U M fifi/@IgE Je@ Z Patented Jan. 6, 1931 UNITED vSTATES PATENT OFFICE' CLIFFORD E. SCOTT,'OF MINNEAPOLIS, MINNESOTA, ASSIGNOR TO MCQUAY RADIATOR CORPORATION, OF MINNEAPOLIS, MINNESOTA, A CORPORATION-OF DELAWARE HEAT-EXCHANGE DEVICE Application led December 24, 1928. Serial No. 328,192.

My present invention relates to an imf proved heat exchange device of the type disclosed and broadly claimed in my United States Letters Patent. heat exchange device, 1,704,409, March 5, 1929.

To the above end, generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In thel accompanying drawings, which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings :A

Fig. 1 is a side elevation ofthe improved heat exchange device, with some parts removed and other parts broken away;

Fig. 2 is a horizontal section taken on the line 2-2 of Fig. 1;

Fig. 3 is a fragmentary perspective view of one of the fins;

Fig. 4 is a fragmentary detail View, principally in section, taken on the line 4--4 of Fig. 2;

Fig. 5 is a view in transverse vertical section taken on the -line 5--5 of Fig. 2;

Fig. 6 is an elevation of the coil before it is folded upon itself;

Fig. 7 is a view corresponding to Fig. 6 but showing the coil folded;

Fig. 8 is a left-hand end elevation of the coil as shown in Fig. 7 h

Fig. 9 is a modification showing a coil formed from two independent laterally spaced sections only one of which is shown;

Fig. 10 is a view corresponding to Fig. 4 but showing a modification of the fins;

" Fig. 11 is a fragmentary perspective view of oneof the fins shown in Fig. 10;

Fig. 12 is a view partly in `elevation and partly in section showing the method of applying the fin shown in Fig. 10to the bends of a coil; and l Fig. 13 is a view corresponding to Flg. but showing a further step in the process-in Which'the fin is f ully positioned on the bends.

Referring first to the invention as shown in Figs. 1 to 8, inclusive.

The numeral l0 indicates a ncontinuous seamless tube for the circulation of a radiatingmedium, and which tube is bent to Formed in each header plate 12 and 13 are two longitudinally extended rows of endwise spaced slots 16 formed'by piercing said plates and pressing the stock therefrom laterally inward to form reinforcing fianges 17 at the edges of said slots. the two rows are staggered in the manner shown in Fig. 2 and the staggered bends 11 in the two sections of the coil are inserted through'said slots, as best shown in Fig.

The flanges 17 not only materially reinforce the header plates 12 and 13, but afford wide supporting surfaces for the bends 11.

Mounted between the header plates 12 and 13 are a multiplicity of laterally spaced flat fins 18, each of which has two longitudinally extended rows of edgewise spaced slots 19. The slots 19 in the two rows of each fin 18 are staggered and the two rows of slots iny the fins 18 and the header plates 12 and 13 are aligned, with the bends 11 extending through the slots 19. These slots 19 are formed by piercing the fins 18 and pressing the stock laterally to form flanges 20 at the edges of said slots. The anges 2O individually space the fins 18 from each other and the flanges 17 The slots k1G in' space the end fins 18 from the header plates 12 and 13. Said flanges 20. in addition to individually spacing the fins 18, afford wide supportingsurfaces which contact with the U-shaped bends 11 and support the fins 18 thereon.

In assembling the heat exchange device, the ns 16 are assembled between the header plates 12 and 13 with the slots 16 and 19 thereof aligned and the U-shaped bends 11 are then inserted through said aligned slots with the header plates 12 and 13 and fins 16 properly spaced by the flanges 17 and 20.

'lhcse [langes 17 and 20 afford metallic contact between the header plates 12 and 13 and tins 18 completely through the heat exchange device, longitudinally in respect to the U-shaped bends 11. Saidlanges 17 and 20 also alford metallic contact with'thc runs ot' the U-shaped bends 11 throughout substantially their full length. With theheat exchange, device thus assembled, the contacting metallic parts thereof are rigidly connected by sweating or otherwise to forni a rigid unit which affords a simple and highly eflicient radiatingr device. Obviously, the

roll, header plates l2 and 13, and tins 18 aft'ord a very large, eticient and compact radiating surface.

Referring to the invention as disclosed in Fig. 9, the coil is formed from two independent laterally spaced sections 21, only one of which is shown, and which section is identical with one of the sections of the coil shown in Fig. 7, except in this instance, the coil sections are not connected by a continuous pipe. Y

In the invention disclosed in Figs. 10 to 13, inclusive, the tins 22 have two rows of spaced holes 2? surrounded by laterally projecting hub-like spacing and contacting flanges These flanges 24 are formed by the stock pressed from the tins 22 in forming the holes 23. Said fins 22 are longitudinally slit at 25 between alternate pairs of holes 23 ot' each row. To assemble the tins 22 on the U-shaped bends 2G, only one of which is shown, of a coil, said bends are pressed through the holes 23, anges 24 and slits 25, as shown in Fig. 12. The stock in the fins 22 at the slits 25 is displaced by the curved ends of the bends 26 and springs back between the runs of said bends after their ends have passed through the slits 25. As the displaced stock of the iins 22 does notl spring back quite into itsoriginal position but, in transverse section through the slits 25, assumes slightly oblique relation to the surface of said fins. it leaves the respective faces of the fins slightly roughened. This method of attaching the tins 22 to a coil affords continuous fin and {iange contact with the runs of the U-shaped bends 26. Furthermore, it per- Inits free circulation of air through the fins' 22 between the flanges 24 thereof; The roughened faces of the tins 22 produced by the insertion of the bends 2G through the slits 25 increases the turbulance ofthe air in passing between the tins 22 and thereby increases the ell'ieiency of the device.

lVhat l claim is:

l. A heat exchange device comprising a' .the header plates `and through which 'aligned apertures said bends extend.

3. A heat exchangedevice comprising a stantially U-sha'ped bends, and va?"phirality of fins having holes through which the'runs of the bends extend and have close Contact therewith, said fins having slits connecting the holes for the pairsof connected runs of the bends. v y f 4.. A heat exchange un-it comprisi-n .a pipew having a U-shaped bend land a fin havingz :t pair of spaced holes for the .runs of. saidll'lend.l and a slit connecting said holes topermitthe displacement of the stock betweenfsaidholes-V by the insertion ofgtheconnected endsoi thel runs therethrough l. to mount the fin YOnfltlie pipe with its runs in said,h olesfJ'.,

5. The structure defined-in gclaiiI-i v4,v iin which the fin is formedfrom flexibleniateh rial, whereby the displacedfstocl between the holes will return to substantially normallpo- -sition after the insertion ot the bend through.,

the fin.

In testimony-,whereof my .'si; Y

CLIFFORDVKE. vse 

